If physical control, randomization, and design features do not eliminate the differential effects of extraneous variables among treatment groups, the experiment
a. has been confounded, but causal statements are still possible
b. has been confounded, and no causal statements are possible
c. must be repeated without the presence of extraneous variables
d. loses external validity, but can still salvage internal validity
Question 2
As sample size increases, the distribution of sample means of samples of size n (when randomly selected) approaches a normal distribution is a fundamental assumption of the central-limit theorem.
Indicate whether the statement is true or false
Antidepressant Effects of Sleep Deprivation
Negative feedback control of a regulated variable.
The effects of alcoholism on the body systems.
A typical variable cam timing control valve. The solenoid is controlled by the engine computer and ...
Non-Hormonal Forms of Birth Control
Physical and indirect aggression of boys and girls across childhood